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net: qrtr: ns: Fix the incorrect usage of rcu_read_lock() 

The rcu_read_lock() is not supposed to lock the kernel_sendmsg() API
since it has the lock_sock() in qrtr_sendmsg() which will sleep. Hence,
fix it by excluding the locking for kernel_sendmsg().

While at it, let's also use radix_tree_deref_retry() to confirm the
validity of the pointer returned by radix_tree_deref_slot() and use
radix_tree_iter_resume() to resume iterating the tree properly before
releasing the lock as suggested by Doug.

Fixes: a7809ff90c ("net: qrtr: ns: Protect radix_tree_deref_slot() using rcu read locks")
Reported-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Alex Elder <elder@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5.9.x+fslc
Manivannan Sadhasivam 2020-10-05 12:46:42 +05:30 committed by David S. Miller
parent 7575fdda56
commit 082bb94fe1
1 changed files with 64 additions and 12 deletions
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76
net/qrtr/ns.c
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@ -193,7 +193,7 @@ static int announce_servers(struct sockaddr_qrtr *sq)
struct qrtr_server *srv;
struct qrtr_node *node;
void __rcu **slot;
int ret = 0;
int ret;
node = node_get(qrtr_ns.local_node);
if (!node)
@ -203,18 +203,27 @@ static int announce_servers(struct sockaddr_qrtr *sq)
/* Announce the list of servers registered in this node */
radix_tree_for_each_slot(slot, &node->servers, &iter, 0) {
srv = radix_tree_deref_slot(slot);
if (!srv)
continue;
if (radix_tree_deref_retry(srv)) {
slot = radix_tree_iter_retry(&iter);
continue;
}
slot = radix_tree_iter_resume(slot, &iter);
rcu_read_unlock();
ret = service_announce_new(sq, srv);
if (ret < 0) {
pr_err("failed to announce new service\n");
goto err_out;
return ret;
}
rcu_read_lock();
}
err_out:
rcu_read_unlock();
return ret;
return 0;
}
static struct qrtr_server *server_add(unsigned int service,
@ -339,7 +348,7 @@ static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
struct qrtr_node *node;
void __rcu **slot;
struct kvec iv;
int ret = 0;
int ret;
iv.iov_base = &pkt;
iv.iov_len = sizeof(pkt);
@ -352,7 +361,16 @@ static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
/* Advertise removal of this client to all servers of remote node */
radix_tree_for_each_slot(slot, &node->servers, &iter, 0) {
srv = radix_tree_deref_slot(slot);
if (!srv)
continue;
if (radix_tree_deref_retry(srv)) {
slot = radix_tree_iter_retry(&iter);
continue;
}
slot = radix_tree_iter_resume(slot, &iter);
rcu_read_unlock();
server_del(node, srv->port);
rcu_read_lock();
}
rcu_read_unlock();
@ -368,6 +386,14 @@ static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
rcu_read_lock();
radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) {
srv = radix_tree_deref_slot(slot);
if (!srv)
continue;
if (radix_tree_deref_retry(srv)) {
slot = radix_tree_iter_retry(&iter);
continue;
}
slot = radix_tree_iter_resume(slot, &iter);
rcu_read_unlock();
sq.sq_family = AF_QIPCRTR;
sq.sq_node = srv->node;
@ -379,14 +405,14 @@ static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
if (ret < 0) {
pr_err("failed to send bye cmd\n");
goto err_out;
return ret;
}
rcu_read_lock();
}
err_out:
rcu_read_unlock();
return ret;
return 0;
}
static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
@ -404,7 +430,7 @@ static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
struct list_head *li;
void __rcu **slot;
struct kvec iv;
int ret = 0;
int ret;
iv.iov_base = &pkt;
iv.iov_len = sizeof(pkt);
@ -447,6 +473,14 @@ static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
rcu_read_lock();
radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) {
srv = radix_tree_deref_slot(slot);
if (!srv)
continue;
if (radix_tree_deref_retry(srv)) {
slot = radix_tree_iter_retry(&iter);
continue;
}
slot = radix_tree_iter_resume(slot, &iter);
rcu_read_unlock();
sq.sq_family = AF_QIPCRTR;
sq.sq_node = srv->node;
@ -458,14 +492,14 @@ static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
if (ret < 0) {
pr_err("failed to send del client cmd\n");
goto err_out;
return ret;
}
rcu_read_lock();
}
err_out:
rcu_read_unlock();
return ret;
return 0;
}
static int ctrl_cmd_new_server(struct sockaddr_qrtr *from,
@ -571,16 +605,34 @@ static int ctrl_cmd_new_lookup(struct sockaddr_qrtr *from,
rcu_read_lock();
radix_tree_for_each_slot(node_slot, &nodes, &node_iter, 0) {
node = radix_tree_deref_slot(node_slot);
if (!node)
continue;
if (radix_tree_deref_retry(node)) {
node_slot = radix_tree_iter_retry(&node_iter);
continue;
}
node_slot = radix_tree_iter_resume(node_slot, &node_iter);
radix_tree_for_each_slot(srv_slot, &node->servers,
&srv_iter, 0) {
struct qrtr_server *srv;
srv = radix_tree_deref_slot(srv_slot);
if (!srv)
continue;
if (radix_tree_deref_retry(srv)) {
srv_slot = radix_tree_iter_retry(&srv_iter);
continue;
}
if (!server_match(srv, &filter))
continue;
srv_slot = radix_tree_iter_resume(srv_slot, &srv_iter);
rcu_read_unlock();
lookup_notify(from, srv, true);
rcu_read_lock();
}
}
rcu_read_unlock();